Delete comment from: Ken Shirriff's blog
I wouldn't knock myself out trying to get an Hp touchpad charger seeing they are getting scarce. There are plenty of other 4-rated chargers to try. Why? Many things like the Pi have onboard regulation that generates the necessary voltages for the components, as with lots of stuff like phones and laptops. Those onboard regulators can cope with a certain amount of noise and have a decent input voltage range. Laptops are a good example to use as their power supplies tend to be noisier than desktop power supplies because they too have an onboard regulator. Just stay away from the really bad ones like the counterfeit ones, they are dangerous anyway. But these things are built to be battery chargers most of the time so theres no guarantee of power quality. Although with portable touch screen devices becoming the norm and sometimes being ac powered all the time, these little chargers are getting better for such a small package. Generally most anything that is not really generic or counterfeit should be good enough most of the time.
Jan 4, 2014, 8:58:03 AM
Posted to A dozen USB chargers in the lab: Apple is very good, but not quite the best